Make aapt2 terminology more inclusive

Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code
for reference

Bug: 162364131
Bug: 162536543
Test: aapt2_tests
Change-Id: I4eef925d6319b40a395fc8d59a3f2912a02ca03b
diff --git a/tools/aapt2/trace/TraceBuffer.h b/tools/aapt2/trace/TraceBuffer.h
index 8618e0e..ba751dd 100644
--- a/tools/aapt2/trace/TraceBuffer.h
+++ b/tools/aapt2/trace/TraceBuffer.h
@@ -40,7 +40,7 @@
 void BeginTrace(const std::string& tag);
 void EndTrace();
 
-// A master trace is required to flush events to disk. Events are formatted in systrace
+// A main trace is required to flush events to disk. Events are formatted in systrace
 // json format.
 class FlushTrace {
 public: